Improvement in the manufacture of glue



PATENT QFFIGE.

WILLIAM ADAMSON, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN THE MANUFACTURE OF GLUE.

Specification forming part of letters Patent No. 157,564, dated December8, 1874; application filed September 1, 1874.

CAsE B.

To all whom it may concern:

Be it known that I, WM. ADAMSON, of Philadelphia, Pennsylvania, haveinvented an Improvement in the Manufacture of Glue, of whichthefollowing is a specification:

The object of my invention is to facilitate and economize themanufacture of glue of a superior quality by the digesting andexpressing operations explained hereafter.

According to the usual process of manufacturing glue, gelatine, or size,the stock is continuously boiled until all the glue is extracted ordissolved from the tissues, such as hair, bone, fiber, 850. Thisprocess, on account of its duration and continuously-applied heat, andthe large amount of water required, deteriorates the gelatine, darkensits color, and impairs its quality; hence I depart from the usualprocess, and conduct the operation in stages in the following manner.

After the glue-stock has been so far digested that it has assumed afluid or semi-fluid consistency, I subject the whole mass to a drain--ing or straining process, conducted under pressure-an operation whichmay be carried into effect in various ways. For instance, the

may be placed in coarse bags, and the gelatinous fluids expressed fromthem, leaving the undissolved stock to be further digested and pressed,and these operations are repeated as many times as the character of'theglue-stock may require.

By thus rapidly and forcibly separating the concentrated glue as it isdissolved from the tissues, the bad effect of the long-continuedapplication of heat on the dissolved or semidissolved gelatine isobviated, an increased product is obtained, and this product is of better quality, and, in addition to all this, the glue is more rapidlyproduced, and in so concentrated a condition as to prevent fermentation.Less room and labor, moreover, are required for conducting theoperation, and less time is required for drying the glue.

I claim as my invention- The process described of mechanicallyexpressing glue, gelatine, or size from partiallydissolved glue-stock,redigesting the latter, and again expressing the glue, all as set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

WILLIAM ADAMSON. Witnesses:

HARRY SMITH, HUBERT HoWsoN.

